Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	$ 1,434,260	$ 811,279
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	7,973,000	6,740,000
Cash and Cash Equivalents, Fair Value Disclosure	1,434,000	811,000
Asset Recovery Damaged Property Costs, Noncurrent	306,651	340,460
Prepaid Expenses and Other Current Assets
Liabilities, Fair Value Disclosure [Abstract]
Other Restricted Assets, Current	9,000	4,000
Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	2,155,000	2,047,000
Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	54,000	30,000
Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	30,000	20,000
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		1,000
Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		2,000
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,000
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,703,000	2,035,000
Cash and Cash Equivalents, Fair Value Disclosure	1,434,000	811,000
Other Restricted Assets, Current	9,000	4,000
Asset Recovery Damaged Property Costs, Noncurrent	307,000	340,000
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	899,000	848,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	54,000	30,000
Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		2,000
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,256,000	1,199,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,256,000	1,199,000
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	30,000	20,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	30,000	20,000
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		1,000
Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	5,000
Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	3,984,000	3,486,000
Entergy New Orleans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	68,477	31,403
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	146,600	118,000
Cash and Cash Equivalents, Fair Value Disclosure	68,500	31,400
Other Restricted Assets, Current	0	1,611
Asset Recovery Damaged Property Costs, Noncurrent	75,859	83,742
Entergy New Orleans [Member] | Prepaid Expenses and Other Current Assets
Liabilities, Fair Value Disclosure [Abstract]
Other Restricted Assets, Current		1,600
Entergy New Orleans [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,200	1,300
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	144,400	116,700
Cash and Cash Equivalents, Fair Value Disclosure	68,500	31,400
Other Restricted Assets, Current		1,600
Asset Recovery Damaged Property Costs, Noncurrent	75,900	83,700
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current		0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,200	1,300
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Other Restricted Assets, Current		0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,200	1,300
Entergy Mississippi [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	327,988	155,509
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	328,400	157,100
Cash and Cash Equivalents, Fair Value Disclosure	328,000	155,500
Entergy Mississippi [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	400
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		500
Entergy Mississippi [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		1,600
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	4,900
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	328,000	157,100
Cash and Cash Equivalents, Fair Value Disclosure	328,000	155,500
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		1,600
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	400	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	400
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis		500
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure on Recurring Basis	4,900
Entergy Louisiana [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	374,559	326,775
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	3,325,100	3,021,200
Cash and Cash Equivalents, Fair Value Disclosure	374,600	326,800
Asset Recovery Damaged Property Costs, Noncurrent	230,792	256,718
Entergy Louisiana [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	951,400	908,100
Entergy Louisiana [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	29,400	14,500
Entergy Louisiana [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	18,400	8,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	974,400	924,000
Cash and Cash Equivalents, Fair Value Disclosure	374,600	326,800
Asset Recovery Damaged Property Costs, Noncurrent	230,800	256,700
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	339,600	326,000
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	29,400	14,500
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	611,800	582,100
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	611,800	582,100
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	18,400	8,600
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Asset Recovery Damaged Property Costs, Noncurrent	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	18,400	8,600
Entergy Louisiana [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,720,500	1,506,500
Entergy Arkansas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	465,092	3,441
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	2,260,800	1,616,300
Cash and Cash Equivalents, Fair Value Disclosure	465,100	3,400
Entergy Arkansas [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	609,300	579,000
Entergy Arkansas [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	19,500	12,900
Entergy Arkansas [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	8,000	8,500
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	759,500	276,200
Cash and Cash Equivalents, Fair Value Disclosure	465,100	3,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	274,900	259,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	19,500	12,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	334,400	319,100
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	334,400	319,100
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	8,000	8,500
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	8,000	8,500
Entergy Arkansas [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	1,158,900	1,012,500
Entergy Texas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	0	184,706
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	10,400	189,300
Cash and Cash Equivalents, Fair Value Disclosure		184,700
Other Restricted Assets, Current	9,025	2,703
Entergy Texas [Member] | Prepaid Expenses and Other Current Assets
Liabilities, Fair Value Disclosure [Abstract]
Other Restricted Assets, Current	9,000	2,700
Entergy Texas [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,400	1,900
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	9,000	187,400
Cash and Cash Equivalents, Fair Value Disclosure		184,700
Other Restricted Assets, Current	9,000	2,700
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure		0
Other Restricted Assets, Current	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,400	1,900
Cash and Cash Equivalents, Fair Value Disclosure		0
Other Restricted Assets, Current	0	0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,400	1,900
System Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	127,330	28,460
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	1,831,500	1,557,600
Cash and Cash Equivalents, Fair Value Disclosure	127,300	28,500
System Energy [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	594,600	559,800
System Energy [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	4,800	2,400
System Energy [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	417,000	293,300
Cash and Cash Equivalents, Fair Value Disclosure	127,300	28,500
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	284,900	262,400
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	4,800	2,400
System Energy [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	309,700	297,400
Cash and Cash Equivalents, Fair Value Disclosure	0	0
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	309,700	297,400
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	0	0
System Energy [Member] | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure [Abstract]
Decommissioning Fund Investments, Fair Value	$ 1,104,800	$ 966,900